Russian forces on Tuesday resumed an assault on the Azovstal steel plant, thought to be the last bastion of a Ukrainian regiment in the besieged city of Mariupol, after civilians were evacuated from the area. Ukrainian fighters announced that Russian forces began storming the facility, which includes a warren of underground tunnels and bunkers. It came as a convoy carrying dozens of civilians evacuated from the plant over the weekend arrived in the relative safety of Ukrainian-controlled Zaporizhzhia.